Process and apparatus for making vehicle-tires.



GEORGE LENNON KAVANAGH, OF MONTREAL, QUEBEG,

CANAD.

PROCESS 0F AND APPARATUS FOR MAKING VEHICLE-TIRES.

Specificationl of Letters Yatent.

Patented July 9, wis.

Application led July 25, 1914. Serial No. 853,145.

To all whom t may concern.' f

Be it known that I, GEORGE LENNoN KAVANAGH, a citizen of the Dominion of Canada, and resident of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certainv new and useful Improvements in Processes of and Apparatus for Making Vehicle-Tires, of which the following is a full, clear, and exact description.

This invention relates to improvements in process of and apparatus for making ve'- hicle tires, and the object is to provide a simple and expeditious method of makin the improved tire hdescribed and claime in -my co-pending application, Ser. No. 853,144.

The invention consists essentially in mold-` ing within a suitable outer casing a filling of comparatively soft elastic material and vulcanizng same in such form that an annular passage of suitable form will be left in the approximate center of the filling.

In the drawings which illustrate the inventionz-f Figure 1 is a cross sectional view of the vulcanizer molds with tire therein.

Fig. 2 is a plan view of the core rings.

Referring more particularly to the drawings, 5 designates a mold, 6 a central core ring formed of a plurality of arcuate pieces,

' softer and more and 7 lateral core rings, also formed of a lurality of arcuate pieces. The mold may e of any usual form suitable for the "work.

The central core ring 6 is very slightly tri angular in cross section, and is held at the base 8 cr narrowest side of the triangle in the mold. Toward the apex this central core ring is shouldered, as shown at 9, to provide a seat for the lateral core rings 7. In

the process of manufacture, a tire shoe 10 of any suitable type is placed in the mold 5 and the central and lateralv core rings inserted within the shoe, and arranged con.-

centric therewith. The s ace between the inner wall of the shoe an the core ring is then illed with rubber or other suitable material of proper consistency and vulcanized, sc as to become practically integral with the shoe and form a filling 11 of material elastic thanr the shoe. After the vulcanizin recess is complete, the mold is opened an the central core ring withdrawn, the surfaces 12 of the filling adjacent the sides of the central core ring are then spread sufficiently apart, and the lateral which when vulcanize core rings 7 withdrawn, piece by piece. The taper of the central core ring is such that when the edges of the tire are pressed together, the surfaces 12 of the filling 'will bear against one another, so as te closel the opening through which the core ring was inserted and leave an annular channel iii the filling. This annular channel retains the shape of the lateral core rings 7, and is either truly elliptic or diamond shaped according to the shape of the core ring. .This shape may, however, be oken of in eral terms as approximate y elliptic. t is essential that the core be located exactly concentric with the tire, as otherwise the walls surrounding the annular passage formed by the core will not be of uniform thickness and the tire will have greater resistance at some points than at-others. .In filling the casing, it is necessar to select material willvbe softer, more resilient and more elastic thanA the material of the casing, and yet of suiicient strength to withstand considerable and continued distortion without tearing, crumbling or otherwise deteriorating.

Having thus described my inventiomwhat Iclaim is 1. A process of making tires, which con- -sists in inserting a casing within a mold, positioning a multi-part core concentrically within said casing, filling the space between the casing and core with suita le material, and vulcanizing until the lillin is rigidly attached to the casing and is o softer and more elastic consistency than the casing.

2. A process of making tires, which consists in vulcanizing a filling of soft elastic material within an outer casing and around a core, withdrawing the core. and contracting the tire to form an annular passage of symmetrical cross section.

3. A process of molding hollow annular rubber articles such as tires, which consists in inserting a circular multipart core having a projecting key portion within a mold, filling the space between the mold and core with material and vulcanizing, removing the key ortion of the core and subsequently removing the core part by part through the passage molded by the projecting key portion, and finallyforming the article by contracting to close the passage molded by the projecting key portion.

4. An apparatus for making tires, comprising the combination of a sectional circular core member approximately triangular in cross sect1on, a shoulder adjacent the outer edge thereof, and a pair of circular sectional Wings of suitable cross sectlon adapted to'be nclosed by the-tire carried by the first ring and forming part of the core and bearing against the shoulder thereof.

5. An apparatus for making tires, comprising the combination with a mold of a central sectional circular core member approximately triangular in cross section, a pair of similar sectional circular core members carried by said central member forming a part of the core and of such cross sectional shape that when the article molded around the core is contracted bringing the surfaces molded by the central core member into engagement, the surfaces molded by the second core membersrwill form Walls of a symmetrical annular channel.

6. An apparatus for molding hollow annular rubber articles, comprising the combination with a mold of a circular sectional core member composed of a central sectional portion, and sectional laterally projecting portions carried by and removable from the central portion While in the molded article.

In Witness whereof, I have lhereunto set my hand, in the presence of two witnesses.

GEORGE LENNoN KAVANAGH.

Witnesses:

S. R. W. ALLEN, G., M. MoRnnANn. 

